Chemical Tests IGCSE

Lilac

Flame Test colour for the potassium ion

Yellow

Flame Test colour for the sodium ion

Red

Flame Test colour for the lithium ion

Orange / red

Flame Test colour for the calcium ion

Green

Flame Test colour for the copper ion

Relights a glowing splint

The test for oxygen Gas

A lit splint makes a squeaky pop sound

The test for hydrogen gas

Turns the limewater cloudy

The test for carbon dioxide gas

Bleaches litmus paper

The test for chlorine gas

Turns damp red litmus paper blue

The test for ammonia gas.

Blue precipitate

This is observed when sodium hydroxide is added to copper (II) ions.

Green precipitate

This is observed when sodium hydroxide is added to iron (II) ions.

Orange precipitate

This is observed when sodium hydroxide is added to iron (III) ions.

Ammonia gas

The product formed when sodium hydroxide is added to ammonium ions.

Iron (III) hydroxide

The product formed when sodium hydroxide is added to iron (III) ions.

Chloride, bromide and iodide

These ions can be tested for using silver nitrate

Sulphate

This anion (negative ion) can be tested for using barium chloride.

Carbonate

This anion (negative ion) can be tested for by adding acid and then testing the gas that is produced with limewater.

Silver bromide

The product formed when silver nitrate is added to bromide ions.

Barium sulphate

The product formed when barium chloride is added to sulphate ions.